情态动词shall,should, must 用法及练习

,Modalverbs,1.shall用于疑问句与第一、三人称连用，表示征求意见或请求许可。1)Shallwegooutforamealtogether?2)Shallthenewcomerhaveatry?,1.-Theroomissodirty._wecleanit?-Ok.AwillBShallCWouldDDo,(2)用于肯定句与二、三人称连用，表示说话人的允诺，决心，威胁，警告，命令，或法律、文件的规定。Nothingshallstopmefromgoingthere.Youshallbesorryforwhatyouhavedone,Itellyou.,决心,威胁/警告,3.Youshallgetanmp5asyourbirthdaypresentthisyear.4.Thefineshallbepaidincash.5.Personsunder18shallnotbeemployed.,（允诺）,（规定）,（规定）,“Theinterest(利息)_bedividedintofiveparts,accordingtotheagreement,”declaredthejudge.mayB.shouldC.mustD.shall,2.should1).Childrenshouldbedevotedtotheirparents.2).Youshouldntbesocareless.,oughtnotto,2）比较有依据的推测将来某种情况，“按理说会，估计会”1)Its2:30,Theyshouldbeherenow.2)Theglassesshouldbeenoughforeachguest.3)Weshouldarrivebeforedark.4)Theroadsshouldbelesscrowdedtoday.,(3)表示惊讶、遗憾、“竟然，居然”Imgladthathissonshouldhavewonthefirstprize.Itsstrangethatheshouldfailagain.Youcantimaginethatawell-behavedgentleman_besorudetoalady.A.mightB.needC.shouldD.would,There_beanydifficultyaboutpassingtheroadtestsinceyouhavepracticedalotinthedrivingschool.(05上海)A.mustntB.shantC.shouldntD.neednt,-WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-They_bereadyby12:00.A.canB.shouldC.mightD.needItsnearlysevenoclock.Jack_behereatanymoment.A.mustB.needC.shouldD.can,3.must-MustIdoitatonce?-Yes,you_./-No,you_.(=No,you_,must,neednt,donthaveto),Youmustntwasteanymoretime.Youmustnotsmokehere.禁止,不可以,千万别,2)肯定推测，“一定，准是”（只能用于肯定句）1.Shemustbetiredaftersuchalongwalk.2.Hemustbesleepingnow.,-Hi,Tom.AnyideawhereJaneis?-She_intheclassroom.Isawhertherejustnow.AshallbeBshouldhavebeenCmustbeDmighthavebeen,(3)must表示固执,不满,意为“偏偏，偏要,非得”-MayIsmokehere?-Ifyou_,chooseaseatinthesmokingsection.A.shouldB.couldC.mayD.must,John,lookatthetime,_youplaythepianoatsuchalatehour?A.MustB.CanC.MayD.Need,1.Whymustyoualwaysbreakinwhenothersaretalking?2.Ifyoumustbreakthelaw,ofcourse,youwillbepunished.,1.Treesaregoodfor